Carrier 19XR Start-up, Operation And Maintenance Instructions Manual

Also see for HERMETIC CENTRIFUGAL LIQUID CHILLERS 19XR: User manual Start-up and service instructions Installation instructions Product data Installation instructions

Contents

Carrier 19XR Start-up, Operation And Maintenance Instructions Manual Manual pdf 12 page image

The PIC II can interface with the Carrier Comfort Net-work (CCN) if desired. It can communicate with otherPIC I or PIC II equipped chillers and other CCN devices.The PIC II consists of 3 modules housed inside 3 majorcomponents. The component names and corresponding con-trol voltages are listed below (also see Table 1):• control panel— all extra low-voltage wiring (24 v or less)• power panel— 230 or 115 v control voltage (per job requirement)— up to 600 v for oil pump power• starter cabinet— chiller power wiring (per job requirement)Table 1 — Major PIC Components andPanel Locations*PIC II COMPONENT PANEL LOCATIONChiller Visual Controller (CVC) and Display Control PanelIntegrated Starter Module (ISM) Starter CabinetChiller Control Module (CCM) Control PanelOil Heater Contactor (1C) Power PanelOil Pump Contactor (2C) Power PanelHot Gas Bypass Relay (3C) (Optional) Power PanelControl Transformers (T1, T2) Power PanelTemperature Sensors See Fig. 7.Pressure Transducers See Fig. 7.*See Fig. 5 and Fig. 7-11.CHILLER VISUAL CONTROLLER (CVC) — The CVC isthe ‘‘brain’’ of the PIC II. This module contains all the op-erating software needed to control the chiller. The CVC ismounted to the control panel (Fig. 10) and is the input centerfor all local chiller set points, schedules, configurablefunctions, and options. The CVC has a stop button, an alarmlight, four buttons for logic inputs, and a backlight display.The backlight will automatically turn off after 15 minutes ofnon-use. The functions of the four buttons or ‘‘softkeys’’ aremenu driven and are shown on the display directly abovethe softkeys.The viewing angle of the CVC can be adjusted for opti-mum viewing. Remove the 2 bolts connecting the controlpanel to the brackets attached to the cooler. Place them inone of the holes to pivot the control panel forward to back-ward to change the viewing angle. See Fig. 10. To changethe contrast of the display, access the adjustment on the backof the CVC. See Fig. 10.INTEGRATED STARTER MODULE (ISM) — This mod-ule is located in the starter cabinet. This module initiates com-mands from the CVC for starter functions such as startingand stopping the compressor, condenser, chilled water pumps,tower fan, spare alarm contacts, and the shunt trip. The ISMmonitors starter inputs such as line voltage, motor current,ground fault, remote start contact, spare safety, condenserhigh pressure, oil pump interlock, starter 1M, and run con-tacts. The ISM contains logic capable of safety shutdown. Itshuts down the chiller if communications with the CVCare lost.CHILLER CONTROL MODULE (CCM) — This moduleis located in the control panel. The CCM provides the inputand outputs necessary to control the chiller. This module moni-tors refrigerant pressure, entering and leaving water tem-peratures, and outputs control for the guide vane actuator,oil heaters, and oil pump. The CCM is the connection pointfor optional demand limit, chilled water reset, remote tem-perature reset, and refrigerant leak sensor.OIL HEATER CONTACTOR (1C) — This contactor is lo-cated in the power panel (Fig. 11) and operates the heater ateither 115 or 230 v. It is controlled by the PIC II to maintainoil temperature during chiller shutdown.OIL PUMP CONTACTOR (2C) — This contactor is locatedin the power panel. It operates all 200 to 575-v oil pumps.The PIC II energizes the contactor to turn on the oil pumpas necessary.HOT GAS BYPASS CONTACTOR RELAY (3C) (Op-tional) — This relay, located in the power panel, controls theopening of the hot gas bypass valve. The PIC II energizesthe relay during low load, high lift conditions.CONTROL TRANSFORMERS (T1, T2) — These trans-formers convert incoming control voltage to 24 vac powerfor the 3 power panel contactor relays, CCM, and CVC.Fig. 8 — Control Sensors (Temperature)Fig. 9 — Control Sensors(Pressure Transducers, Typical)12